linux-kernel - Does __KERNEL_DS serve a purpose?

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Date:	Thu, 7 Apr 2016 17:24:54 -0700
From:	Andy Lutomirski <luto@...nel.org>
To:	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	kvm list <kvm@...r.kernel.org>,
	xen-devel <Xen-devel@...ts.xen.org>,
	Borislav Petkov <bp@...en8.de>
Subject: Does __KERNEL_DS serve a purpose?

I can't see any reason that we need the __KERNEL_DS segment at all --
I think that everything that uses __KERNEL_DS could use __USER_DS
instead.  Am I missing anything?  This has been bugging me for a
while.

I mulled over this a bit when trying to understand the sysret_ss_attrs
bug and then forgot about it.

--Andy